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UserInterfaceManager.cs
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UserInterfaceManager.cs
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using System;
using System.Collections.Generic;
using System.Runtime.CompilerServices;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
using Monochrome.GUI.Controls;
namespace Monochrome.GUI
{
internal sealed class UserInterfaceManager : IDisposable, IUserInterfaceManagerInternal
{
public UITheme ThemeDefaults { get; private set; }
public Stylesheet Stylesheet { get; set; }
public Control KeyboardFocused { get; private set; }
// When a control receives a mouse down it must also receive a mouse up and mouse moves, always.
// So we keep track of which control is "focused" by the mouse.
private Control _controlFocused;
public LayoutContainer StateRoot { get; private set; }
public PopupContainer ModalRoot { get; private set; }
public Control CurrentlyHovered { get; private set; }
public float UIScale { get; set; } = 1;
public Control RootControl { get; private set; }
public LayoutContainer WindowRoot { get; private set; }
public LayoutContainer PopupRoot { get; private set; }
private readonly List<Control> _modalStack = new List<Control>();
private bool _rendering = true;
private readonly Queue<Control> _styleUpdateQueue = new Queue<Control>();
private readonly Queue<Control> _layoutUpdateQueue = new Queue<Control>();
public void Initialize()
{
ThemeDefaults = new UIThemeDummy();
_initializeCommon();
GUIGameComponent.Singleton.OnWindowResized += _updateRootSize;
}
private void _initializeCommon()
{
RootControl = new Control
{
Name = "UIRoot",
MouseFilter = Control.MouseFilterMode.Ignore,
IsInsideTree = true
};
RootControl.Size = GUIGameComponent.ScreenSize / UIScale;
//TODO: GUIGameComponent.Singleton.OnWindowResized += args => _updateRootSize();
StateRoot = new LayoutContainer
{
Name = "StateRoot",
MouseFilter = Control.MouseFilterMode.Ignore
};
RootControl.AddChild(StateRoot);
WindowRoot = new LayoutContainer
{
Name = "WindowRoot",
MouseFilter = Control.MouseFilterMode.Ignore
};
RootControl.AddChild(WindowRoot);
PopupRoot = new LayoutContainer
{
Name = "PopupRoot",
MouseFilter = Control.MouseFilterMode.Ignore
};
RootControl.AddChild(PopupRoot);
ModalRoot = new PopupContainer
{
Name = "ModalRoot",
MouseFilter = Control.MouseFilterMode.Ignore,
};
RootControl.AddChild(ModalRoot);
}
public void InitializeTesting()
{
ThemeDefaults = new UIThemeDummy();
_initializeCommon();
}
public void Dispose()
{
RootControl?.Dispose();
}
public void Update(GameTime args)
{
RootControl.DoUpdate(args);
}
public void FrameUpdate(GameTime args)
{
RootControl.DoFrameUpdate(args);
// Process queued style & layout updates.
while (_styleUpdateQueue.Count != 0)
{
var control = _styleUpdateQueue.Dequeue();
if (control.Disposed)
{
continue;
}
control.DoStyleUpdate();
}
while (_layoutUpdateQueue.Count != 0)
{
var control = _layoutUpdateQueue.Dequeue();
if (control.Disposed)
{
continue;
}
control.DoLayoutUpdate();
}
}
public void InputEvent(InputEventArgs args)
{
switch (args)
{
case MouseButtonEventArgs mouseButton:
if (mouseButton.State == KeyState.Down)
MouseButtonDown(mouseButton);
else
MouseButtonUp(mouseButton);
break;
case MouseWheelEventArgs mouseWheel:
MouseWheel(mouseWheel);
break;
case MouseMoveEventArgs mouseMove:
MouseMove(mouseMove);
break;
case TextEventArgs textEvent:
TextEntered(textEvent);
break;
case KeyEventArgs keyEvent:
if (keyEvent.State == KeyState.Down)
KeyDown(keyEvent);
else
KeyUp(keyEvent);
break;
}
}
public void MouseButtonDown(MouseButtonEventArgs args)
{
var control = MouseGetControl(args.PointerLocation);
if (args.CanFocus)
{
// If we have a modal open and the mouse down was outside it, close said modal.
if (_modalStack.Count != 0)
{
var top = _modalStack[_modalStack.Count - 1];
var offset = args.PointerLocation - top.GlobalPixelPosition.ToVector2();
if (!top.HasPoint(offset / UIScale))
{
RemoveModal(top);
return;
}
}
ReleaseKeyboardFocus();
if (control == null)
{
return;
}
_controlFocused = control;
if (_controlFocused.CanKeyboardFocus && _controlFocused.KeyboardFocusOnClick)
{
_controlFocused.GrabKeyboardFocus();
}
}
else if (KeyboardFocused != null)
{
control = KeyboardFocused;
}
if (control == null)
{
return;
}
var guiArgs = new GUIMouseButtonEventArgs(args.Button, args.State, control, args.Position / UIScale,
args.Position, args.Position / UIScale - control.GlobalPosition,
args.Position - control.GlobalPixelPosition.ToVector2());
_doMouseGuiInput(control, guiArgs, (c, ev) => c.MouseButtonDown(ev));
if (args.CanFocus)
{
args.Handle();
}
}
public void MouseButtonUp(MouseButtonEventArgs args)
{
var control = _controlFocused ?? KeyboardFocused ?? MouseGetControl(args.PointerLocation);
if (control == null)
{
return;
}
var guiArgs = new GUIMouseButtonEventArgs(args.Button, args.State, control, args.Position / UIScale,
args.Position, args.Position / UIScale - control.GlobalPosition,
args.Position - control.GlobalPixelPosition.ToVector2());
_doMouseGuiInput(control, guiArgs, (c, ev) => c.MouseButtonUp(ev));
_controlFocused = null;
// Always mark this as handled.
// The only case it should not be is if we do not have a control to click on,
// in which case we never reach this.
args.Handle();
}
public void MouseMove(MouseMoveEventArgs mouseMoveEventArgs)
{
// Update which control is considered hovered.
var newHovered = MouseGetControl(mouseMoveEventArgs.Position);
if (newHovered != CurrentlyHovered)
{
CurrentlyHovered?.MouseExited();
CurrentlyHovered = newHovered;
CurrentlyHovered?.MouseEntered();
}
var target = _controlFocused ?? newHovered;
if (target != null)
{
var guiArgs = new GUIMouseMoveEventArgs(mouseMoveEventArgs.Relative / UIScale,
target,
mouseMoveEventArgs.Position / UIScale, mouseMoveEventArgs.Position,
mouseMoveEventArgs.Position / UIScale - target.GlobalPosition,
mouseMoveEventArgs.Position - target.GlobalPixelPosition.ToVector2());
_doMouseGuiInput(target, guiArgs, (c, ev) => c.MouseMove(ev));
}
}
public void MouseWheel(MouseWheelEventArgs args)
{
var control = MouseGetControl(args.Position);
if (control == null)
{
return;
}
args.Handle();
var guiArgs = new GUIMouseWheelEventArgs(args.Delta, control,
args.Position / UIScale, args.Position,
args.Position / UIScale - control.GlobalPosition, args.Position - control.GlobalPixelPosition.ToVector2());
_doMouseGuiInput(control, guiArgs, (c, ev) => c.MouseWheel(ev), true);
}
public void TextEntered(TextEventArgs textEvent)
{
if (KeyboardFocused == null)
{
return;
}
var guiArgs = new GUITextEventArgs(KeyboardFocused, textEvent.CodePoint);
KeyboardFocused.TextEntered(guiArgs);
}
public void KeyDown(KeyEventArgs args)
{
var control = MouseGetControl(args.PointerLocation);
if (args.CanFocus)
{
// If we have a modal open and the mouse down was outside it, close said modal.
if (_modalStack.Count != 0)
{
var top = _modalStack[_modalStack.Count - 1];
var offset = args.PointerLocation - top.GlobalPixelPosition.ToVector2();
if (!top.HasPoint(offset / UIScale))
{
RemoveModal(top);
return;
}
}
ReleaseKeyboardFocus();
if (control == null)
{
return;
}
_controlFocused = control;
if (_controlFocused.CanKeyboardFocus && _controlFocused.KeyboardFocusOnClick)
{
_controlFocused.GrabKeyboardFocus();
}
}
else if (KeyboardFocused != null)
{
control = KeyboardFocused;
}
if (control == null)
{
return;
}
var guiArgs = new GUIKeyEventArgs(control, args.Key, args.State, args.PointerLocation, args.IsRepeat, args.Alt, args.Control, args.Shift, args.System);
_doGuiInput(control, guiArgs, (c, ev) => c.KeyDown(ev));
if (args.CanFocus)
{
args.Handle();
}
}
public void KeyUp(KeyEventArgs args)
{
//TODO: throw new NotImplementedException();
}
public void DisposeAllComponents()
{
RootControl.DisposeAllChildren();
}
// TODO: Uncomment
/* public void Popup(string contents, string title = "Alert!")
{
var popup = new SS14Window
{
Title = title
};
popup.Contents.AddChild(new Label {Text = contents});
popup.OpenCenteredMinSize();
}*/
public Control MouseGetControl(Vector2 coordinates)
{
return _mouseFindControlAtPos(RootControl, coordinates);
}
/// <inheritdoc />
public void GrabKeyboardFocus(Control control)
{
if (control == null)
{
throw new ArgumentNullException(nameof(control));
}
if (!control.CanKeyboardFocus)
{
throw new ArgumentException("Control cannot get keyboard focus.", nameof(control));
}
if (control == KeyboardFocused)
{
return;
}
ReleaseKeyboardFocus();
KeyboardFocused = control;
KeyboardFocused.FocusEntered();
}
public void ReleaseKeyboardFocus()
{
var oldFocused = KeyboardFocused;
oldFocused?.FocusExited();
KeyboardFocused = null;
}
public void ReleaseKeyboardFocus(Control ifControl)
{
if (ifControl == null)
{
throw new ArgumentNullException(nameof(ifControl));
}
if (ifControl == KeyboardFocused)
{
ReleaseKeyboardFocus();
}
}
public void ControlHidden(Control control)
{
// Does the same thing but it could later be changed so..
ControlRemovedFromTree(control);
}
public void ControlRemovedFromTree(Control control)
{
ReleaseKeyboardFocus(control);
RemoveModal(control);
if (control == CurrentlyHovered)
{
control.MouseExited();
CurrentlyHovered = null;
}
if (control == _controlFocused)
{
_controlFocused = null;
}
}
public void PushModal(Control modal)
{
_modalStack.Add(modal);
}
public void RemoveModal(Control modal)
{
if (_modalStack.Remove(modal))
{
modal.ModalRemoved();
}
}
public void Render(IRenderHandle renderHandle)
{
if (!_rendering)
{
return;
}
_render(renderHandle, RootControl, Point.Zero, Color.White, null);
}
public void QueueStyleUpdate(Control control)
{
_styleUpdateQueue.Enqueue(control);
}
public void QueueLayoutUpdate(Control control)
{
_layoutUpdateQueue.Enqueue(control);
}
private static void _render(IRenderHandle renderHandle, Control control, Point position, Color modulate,
UIBox2i? scissorBox)
{
if (!control.Visible)
{
return;
}
// Manual clip test with scissor region as optimization.
var controlBox = new UIBox2i(position, control.PixelSize);
if (scissorBox != null)
{
var clipMargin = control.RectDrawClipMargin;
var clipTestBox = new UIBox2i(controlBox.Left - clipMargin, controlBox.Top - clipMargin,
controlBox.Right + clipMargin, controlBox.Bottom + clipMargin);
if (!scissorBox.Value.Intersects(clipTestBox))
{
return;
}
}
var handle = renderHandle.DrawingHandleScreen;
handle.SetTransform(position.ToVector2(),Vector2.One);
modulate = ColorHelper.Multiply(modulate, control.Modulate);
handle.Modulate = ColorHelper.Multiply(modulate, control.ActualModulateSelf);
var clip = control.RectClipContent;
var scissorRegion = scissorBox;
if (clip)
{
scissorRegion = controlBox;
if (scissorBox != null)
{
// Make the final scissor region a sub region of scissorBox
var s = scissorBox.Value;
var result = s.Intersection(scissorRegion.Value);
if (result == null)
{
// Uhm... No intersection so... don't draw anything at all?
return;
}
scissorRegion = result.Value;
}
renderHandle.SetScissor(scissorRegion);
}
control.DrawInternal(renderHandle);
foreach (var child in control.Children)
{
_render(renderHandle, child, position + child.PixelPosition, modulate, scissorRegion);
}
if (clip)
{
renderHandle.SetScissor(scissorBox);
}
}
private Control _mouseFindControlAtPos(Control control, Vector2 position)
{
for (var i = control.ChildCount - 1; i >= 0; i--)
{
var child = control.GetChild(i);
if (!child.Visible || (child.RectClipContent && !child.PixelRect.Contains(position.ToPoint())))
{
continue;
}
var maybeFoundOnChild = _mouseFindControlAtPos(child, position - child.PixelPosition.ToVector2());
if (maybeFoundOnChild != null)
{
return maybeFoundOnChild;
}
}
if (control.MouseFilter != Control.MouseFilterMode.Ignore && control.HasPoint(position / UIScale))
{
return control;
}
return null;
}
private static void _doMouseGuiInput<T>(Control control, T guiEvent, Action<Control, T> action,
bool ignoreStop = false)
where T : GUIMouseEventArgs
{
while (control != null)
{
if (control.MouseFilter != Control.MouseFilterMode.Ignore)
{
action(control, guiEvent);
if (guiEvent.Handled || (!ignoreStop && control.MouseFilter == Control.MouseFilterMode.Stop))
{
break;
}
}
guiEvent.RelativePosition += control.Position;
guiEvent.RelativePixelPosition += control.PixelPosition.ToVector2();
control = control.Parent;
guiEvent.SourceControl = control;
}
}
private static void _doGuiInput<T>(Control control, T guiEvent, Action<Control, T> action,
bool ignoreStop = false)
where T : InputEventArgs
{
while (control != null)
{
if (control.MouseFilter != Control.MouseFilterMode.Ignore)
{
action(control, guiEvent);
if (guiEvent.Handled || (!ignoreStop && control.MouseFilter == Control.MouseFilterMode.Stop))
{
break;
}
}
control = control.Parent;
}
}
private void _uiScaleChanged(float newValue)
{
UIScale = newValue;
if (RootControl == null)
{
return;
}
_propagateUIScaleChanged(RootControl);
_updateRootSize(GUIGameComponent.ScreenSize);
}
private static void _propagateUIScaleChanged(Control control)
{
control.UIScaleChanged();
foreach (var child in control.Children)
{
_propagateUIScaleChanged(child);
}
}
private void _updateRootSize(Vector2 screenSize)
{
RootControl.Size = screenSize / UIScale;
}
/// <summary>
/// Converts
/// </summary>
/// <param name="args">Event data values for a bound key state change.</param>
private void OnUIKeyBindStateChanged(MouseButtonEventArgs args)
{
if (!args.CanFocus && KeyboardFocused != null)
{
args.Handle();
}
if (args.State == KeyState.Down)
{
MouseButtonDown(args);
}
else
{
MouseButtonUp(args);
}
}
}
}